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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681939702633382f4f0f73730147775008b348afd2c784cf13403a404d858f10' 
  AND token = 'rSvKZNOq2P5EoEYP0x04SS4Dwv8CSmZhj+micjPV3EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}